General Information:
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SMTP is outoging email. When you create an email message and click
Send, the email is shown in your outbox. This email is then forwarded
to your providers SMTP server. From there it is sent to the appropriate
server end for delivery.

POP3 is incoming email. This email is spooled by your provider, and
is downloaded by your email client. Since it is spooled (stored) on
the providers server you can usually use some sort of web based email
tool to manipulate email on the server.

IMAP is incoming email. Like POP3, IMAP is email that is spooled on
your providers mail server. The key difference is that IMAP is always
stored on the server until you select to delete and then purge the
email. POP3 usually downloads and removed the messages off the
server (however, this can be overridden).

Using your providers SMTP Server:
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You should use your providers SMTP server to send email. The reason
for this is that many providers have started locking down their
networks. This is due mostly to the fact that virii of today have
built in SMTP servers. These rogue programs will run an SMTP server
behind the scenes on your computer that will constantly send out
spam email to the world.

Using a providers SMTP server forces email to be filtered by tools
that will not allow spam emails to be distributed. Many providers
were listed as spammers due to the past activity on their networks
and were forced to go this route.

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